/* Copyright (c) 2009 Christopher Humphries, Maxime Simon
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package userinterface.action;

import java.awt.event.ActionEvent;

import javax.swing.AbstractAction;
import javax.swing.JTextArea;

import userinterface.ActionHandler;
import userinterface.GraphicalInterface;

import command.Command;

/**
 * @author Humphries Christopher - Simon Maxime
 * 
 */
public class Backspace extends AbstractAction {

    private static final long serialVersionUID = 1L;
    private GraphicalInterface m_graphicalInterface;
    private ActionHandler m_actionHandler;
    private JTextArea m_textArea;
    private Command m_erase;

    /**
     * @param graphicalInterface
     * @param actionHandler
     * @param textArea
     * @param erase
     */
    public Backspace(GraphicalInterface graphicalInterface,
	    ActionHandler actionHandler, JTextArea textArea, Command erase) {
	m_graphicalInterface = graphicalInterface;
	m_actionHandler = actionHandler;
	m_textArea = textArea;
	m_erase = erase;
    }

    /**
     * @param start
     * @param end
     */
    private void erase(int start, int end) {
	m_actionHandler.setTempStart(start);
	m_actionHandler.setTempEnd(end);
	try {
	    m_erase.execute();
	    m_graphicalInterface.updateHistBar();
	    m_textArea.replaceRange("", start, end);
	} catch (Exception e) {
	    m_graphicalInterface.showErrorMsg("Failed to erase.");
	}
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * java.awt.event.ActionListener#actionPerformed(java.awt.event.ActionEvent)
     */
    @Override
    public void actionPerformed(ActionEvent e) {
	int start = m_textArea.getSelectionStart();
	int end = m_textArea.getSelectionEnd();

	if (start == end) {
	    if (start > 0) {
		erase(start - 1, end);
		m_actionHandler.addMacroAction("Backspace at " + start);
	    }
	} else {
	    erase(start, end);
	    m_actionHandler.addMacroAction("Erase from " + start + " to " + end);
	}
    }
}
